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1 — Intention
Intend in your heart that you are performing wudu for prayer. The intention lives in the heart; you do not need to say it aloud.
The evidence
«إِنَّمَا الأَعْمَالُ بِالنِّيَّاتِ، وَإِنَّمَا لِكُلِّ امْرِئٍ مَا نَوَى»
Actions are but by intentions, and every person shall have only what they intended.
Sahih al-Bukhari 1— Read the original text